import { mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";
import { expect, type Page, type TestInfo } from "@playwright/test";
import { copyPluginExample, pluginRequirements } from "./plugin-fixture";
import { connectNewWorkspaceDaemonClient } from "./new-workspace";
import { openAgentRoute, seedMockAgentWorkspace, type MockAgentWorkspace } from "./mock-agent";

const PLUGIN_ID = "timeline-transform-e2e";
export const ASSISTANT_TEXT =
  "Skill header\n\n# Instructions\n\nRead every paragraph and preserve the full message while this response is still streaming.";

const CLIENT_SOURCE = `import React, { useState } from "react";
import { Text, View, Pressable } from "react-native";
import { z } from "zod";

function Card({ item }) {
  const [count, setCount] = useState(0);
  return <View>
    <Text accessibilityRole="header">{item.data.label + " " + item.data.phase}</Text>
    <Text>{item.data.text}</Text>
    <Pressable accessibilityRole="button" onPress={() => setCount(count + 1)}>
      <Text>{"Card clicks " + count}</Text>
    </Pressable>
  </View>;
}

export default function contribute(client) {
  for (const itemType of ["assistant_message", "tool_call"]) {
    client.addTimelineTransformer({
      id: itemType.replaceAll("_", "-"),
      query: { itemType },
      transform({ item, phase }) {
        return { items: [{ type: "plugin", kind: "card", version: 1, data: {
          label: item.type === "tool_call" ? "Tool " + item.name : "Assistant",
          text: item.type === "tool_call" ? item.callId : item.text,
          phase,
        } }] };
      },
    });
  }
  client.addTimelineRenderer({
    kind: "card", version: 1,
    schema: z.object({ label: z.string(), text: z.string(), phase: z.enum(["streaming", "complete"]) }),
    Component: Card,
  });
  return () => {};
}`;

const PROMPT_PLUGIN_ID = "timeline-prompt-e2e";

function promptClientSource(prompts?: readonly string[]): string {
  return `import React from "react";
import { Text, View } from "react-native";
import { z } from "zod";

const selectedPrompts = ${JSON.stringify(prompts ?? null)};

function PromptCard({ item }) {
  return <View testID="plugin-prompt"><Text>{item.data.text}</Text></View>;
}

export default function contribute(client) {
  client.addTimelineTransformer({
    id: "prompt",
    query: { itemType: "user_message" },
    transform({ item }) {
      if (selectedPrompts && !selectedPrompts.includes(item.text)) return undefined;
      return { items: [{ type: "plugin", kind: "prompt", version: 1, data: { text: item.text } }] };
    },
  });
  client.addTimelineRenderer({
    kind: "prompt", version: 1,
    schema: z.object({ text: z.string() }),
    Component: PromptCard,
  });
  return () => {};
}`;
}

async function withDirectoryPlugin(options: {
  pluginId: string;
  source: string;
  run: () => Promise<void>;
}): Promise<void> {
  const { pluginId, source, run } = options;
  const directory = await mkdtemp(path.join(tmpdir(), "paseo-timeline-plugin-"));
  const pluginClient = await connectNewWorkspaceDaemonClient({ ownProjects: false });
  const previous = await pluginClient.getDaemonConfig();
  try {
    await writeFile(
      path.join(directory, "paseo-plugin.json"),
      JSON.stringify({ id: pluginId, requirements: pluginRequirements }),
    );
    await writeFile(path.join(directory, "index.client.tsx"), source);
    await pluginClient.patchDaemonConfig({ pluginsEnabled: true });
    await pluginClient.installDirectoryPlugin(directory);
    await run();
  } finally {
    await pluginClient.removePlugin(pluginId);
    await pluginClient.patchDaemonConfig({
      pluginsEnabled: previous.config.pluginsEnabled ?? false,
    });
    await pluginClient.close();
    await rm(directory, { recursive: true, force: true });
  }
}

export async function withTimelinePlugin(
  page: Page,
  info: TestInfo,
  mode: "assistant" | "tools",
  run: (agent: MockAgentWorkspace) => Promise<void>,
): Promise<void> {
  info.setTimeout(120_000);
  await page.addInitScript(() => {
    localStorage.setItem(
      "@paseo:app-settings",
      JSON.stringify({ toolCallDetailLevel: "overview" }),
    );
  });
  const agent = await seedMockAgentWorkspace({
    repoPrefix: "timeline-plugin-",
    title: "Timeline plugin regression",
    model: "ten-second-stream",
    featureValues:
      mode === "assistant"
        ? {
            mockStreamingAssistantResponse: ASSISTANT_TEXT,
            mockStreamingAssistantIntervalMs: 300,
          }
        : {},
  });
  try {
    await withDirectoryPlugin({
      pluginId: PLUGIN_ID,
      source: CLIENT_SOURCE,
      run: async () => {
        try {
          await openAgentRoute(page, agent);
          await expect(
            page.getByRole("textbox", { name: "Message agent..." }).first(),
          ).toBeVisible();
          await run(agent);
          await info.attach("timeline-plugin", {
            body: await page.screenshot({ path: info.outputPath("timeline-plugin.png") }),
            contentType: "image/png",
          });
        } catch (error) {
          await info.attach("timeline-before-cleanup", {
            body: await page.screenshot({ path: info.outputPath("timeline-before-cleanup.png") }),
            contentType: "image/png",
          });
          throw error;
        }
      },
    });
  } finally {
    await agent.cleanup();
  }
}

/** Draws all prompts, or only the selected prompts, as plugin cards. */
export async function withPromptTimelinePlugin(
  run: () => Promise<void>,
  prompts?: readonly string[],
): Promise<void> {
  await withDirectoryPlugin({
    pluginId: PROMPT_PLUGIN_ID,
    source: promptClientSource(prompts),
    run,
  });
}

export async function expectPromptsDrawnByPlugin(page: Page): Promise<void> {
  const timeline = page.locator('[data-testid="agent-chat-scroll"]:visible').first();
  await expect(timeline.getByTestId("plugin-prompt").first()).toBeVisible({ timeout: 30_000 });
  await expect(timeline.getByTestId("user-message")).toHaveCount(0);
}

export async function requestPluginTimeline(agent: MockAgentWorkspace): Promise<void> {
  await agent.client.sendAgentMessage(agent.agentId, "Exercise timeline transforms.");
}

export async function interactWithStreamingCard(page: Page): Promise<void> {
  await expect(page.getByRole("heading", { name: "Assistant streaming", exact: true })).toHaveCount(
    1,
  );
  await page.getByRole("button", { name: "Card clicks 0", exact: true }).click();
  await expect(page.getByText(/Skill header\s+# Instructions/)).toBeVisible();
  await expect(page.getByRole("heading", { name: "Assistant streaming", exact: true })).toHaveCount(
    1,
  );
  await expect(page.getByRole("button", { name: "Card clicks 1", exact: true })).toBeVisible();
  await expect(page.getByTestId("assistant-message")).toHaveCount(0);
}

export async function expectWholeCompletedCard(page: Page): Promise<void> {
  await expect(page.getByRole("heading", { name: "Assistant complete", exact: true })).toHaveCount(
    1,
  );
  await expect(page.getByText(ASSISTANT_TEXT, { exact: true })).toBeVisible();
  await expect(page.getByTestId("assistant-message")).toHaveCount(0);
}

export async function expectBothConsecutiveTools(page: Page): Promise<void> {
  // read and grep are consecutive source calls in the fixture. Overview used to
  // send only the later call to the plugin, so the read card never existed.
  const read = page.getByRole("heading", { name: "Tool read complete", exact: true }).first();
  await read.scrollIntoViewIfNeeded();
  await expect(read).toBeVisible();
  const grep = page.getByRole("heading", { name: "Tool grep complete", exact: true }).first();
  await grep.scrollIntoViewIfNeeded();
  await expect(grep).toBeVisible();
}

/** The row belongs to the virtualized history, not the always-mounted recent window. */
export async function expectVirtualizedPluginPromptVisible(
  page: Page,
  prompt: string,
): Promise<void> {
  const timeline = page.locator('[data-testid="agent-chat-scroll"]:visible').first();
  await expect(
    timeline.locator("[data-index]").getByTestId("plugin-prompt").filter({ hasText: prompt }),
  ).toBeVisible();
}

export async function attachPromptTimelineEvidence(page: Page, info: TestInfo): Promise<void> {
  await info.attach("plugin-outline-jump", {
    body: await page.screenshot({ path: info.outputPath("plugin-outline-jump.png") }),
    contentType: "image/png",
  });
}

const POPOVER_CLIENT_SOURCE = `import React, { useEffect, useRef } from "react";
import { z } from "zod";

function Preview() {
  const panel = useRef(null);
  useEffect(() => {
    const close = (event) => {
      if (event.key === "Escape" && panel.current.matches(":popover-open")) {
        panel.current.hidePopover();
      }
    };
    document.addEventListener("keydown", close, true);
    return () => document.removeEventListener("keydown", close, true);
  }, []);
  return <div>
    <button onMouseEnter={() => panel.current.showPopover()}>Hover plugin preview</button>
    <div ref={panel} popover="manual" role="dialog" aria-label="Plugin preview">Plugin hover preview</div>
  </div>;
}

export default function contribute(client) {
  client.addTimelineTransformer({
    id: "preview", query: { itemType: "user_message" },
    transform({ item }) {
      if (item.text !== "Show the plugin preview.") return;
      return { items: [{ type: "plugin", kind: "preview", version: 1, data: {} }] };
    },
  });
  client.addTimelineRenderer({
    kind: "preview", version: 1, schema: z.object({}), Component: Preview,
  });
  return () => {};
}`;

/** Installs a timeline preview that owns Escape through the DOM Popover API. */
export async function withPopoverTimelinePlugin(run: () => Promise<void>): Promise<void> {
  await withDirectoryPlugin({
    pluginId: "timeline-popover-e2e",
    source: POPOVER_CLIENT_SOURCE,
    run,
  });
}

const THOUGHT =
  "Need to find the scroll container, the layout effect that watches for new messages, and any gesture handler that might fight with programmatic scrolling. Probably a ref on the FlatList plus a near-bottom threshold.";

/** Exercises the maintained inline-thinking renderer against real streamed reasoning. */
export async function viewInlineThinkingExample(page: Page, info: TestInfo): Promise<void> {
  info.setTimeout(120_000);
  const example = await copyPluginExample("inline-thinking");
  const client = await connectNewWorkspaceDaemonClient({ ownProjects: false });
  const previous = await client.getDaemonConfig();
  const agent = await seedMockAgentWorkspace({
    repoPrefix: "inline-thinking-",
    title: "Inline thinking example",
    model: "one-minute-stream",
  });
  try {
    await client.patchDaemonConfig({ pluginsEnabled: true });
    await client.installDirectoryPlugin(example.directory);
    await openAgentRoute(page, agent);
    await expect(page.getByRole("textbox", { name: "Message agent..." }).first()).toBeVisible();
    await requestPluginTimeline(agent);
    const thought = page.getByText(/^Need to find the scroll container/);
    await expect(thought).toBeVisible({ timeout: 60_000 });
    await expect(thought).not.toHaveText(THOUGHT);
    await info.attach("inline-thinking-streaming", {
      body: await page.screenshot({ path: info.outputPath("inline-thinking-streaming.png") }),
      contentType: "image/png",
    });
    await expect(thought).toHaveText(THOUGHT, { timeout: 30_000 });
  } finally {
    await client.removePlugin("inline-thinking");
    await client.patchDaemonConfig({ pluginsEnabled: previous.config.pluginsEnabled ?? false });
    await client.close();
    await agent.cleanup();
    await example.cleanup();
  }
}